WO2014147688A1 - Dispositif d'affichage d'image et procédé d'affichage d'image - Google Patents

Dispositif d'affichage d'image et procédé d'affichage d'image Download PDF

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Publication number
WO2014147688A1
WO2014147688A1 PCT/JP2013/007626 JP2013007626W WO2014147688A1 WO 2014147688 A1 WO2014147688 A1 WO 2014147688A1 JP 2013007626 W JP2013007626 W JP 2013007626W WO 2014147688 A1 WO2014147688 A1 WO 2014147688A1
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WO
WIPO (PCT)
Prior art keywords
light
image display
display device
fly
light source
Prior art date
Application number
PCT/JP2013/007626
Other languages
English (en)
Japanese (ja)
Inventor
純平 中嶋
晃二 喜田
Original Assignee
ソニー株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ソニー株式会社 filed Critical ソニー株式会社
Priority to JP2015506376A priority Critical patent/JP6304237B2/ja
Priority to US14/776,191 priority patent/US9716869B2/en
Publication of WO2014147688A1 publication Critical patent/WO2014147688A1/fr
Priority to US15/618,645 priority patent/US10506208B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3155—Modulator illumination systems for controlling the light source
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/12—Beam splitting or combining systems operating by refraction only
    • G02B27/123—The splitting element being a lens or a system of lenses, including arrays and surfaces with refractive power
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
    • G02B27/285—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining comprising arrays of elements, e.g. microprisms
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/48—Laser speckle optics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/005—Diaphragms
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/208—Homogenising, shaping of the illumination light
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/3144—Cooling systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3161—Modulator illumination systems using laser light sources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3164—Modulator illumination systems using multiple light sources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3167—Modulator illumination systems for polarizing the light beam
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3197—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using light modulating optical valves
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/0056—Arrays characterized by the distribution or form of lenses arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/16—Cooling; Preventing overheating
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2073—Polarisers in the lamp house

Definitions

  • the present technology relates to an image display device such as a projector and an image display method.
  • Patent Document 1 describes a technique related to an illumination optical system of such a projector.
  • an object of the present technology is to provide a high-performance image display device and an image display method using a laser light source.
  • an image display device includes a light source unit, one or more reflective light modulation elements, an optical system, and a light shielding plate.
  • the light source unit includes at least one laser light source.
  • the one or more reflective light modulation elements modulate incident light and reflect the modulated light.
  • the optical system divides the light from the light source unit into a plurality of divided light beams, which are superimposed on each of the one or more reflective light modulation elements.
  • the light-shielding plate is disposed in the optical system, and is disposed on each path of the plurality of divided lights, and a light-shielding unit that shields reflected light from the reflective light modulation element to the light source unit And have.
  • the light from the laser light source is divided into a plurality of divided lights and superimposed on the reflective light modulation element.
  • the reflected light from the reflective light modulation element to the light source unit is shielded without blocking the plurality of divided lights traveling to the reflective light modulation element by the light shielding plate. Thereby, the influence on the light source part by the reflected light can be prevented. As a result, a high-performance image display device using a laser light source can be realized.
  • the optical system may include a first fly-eye lens into which light from the light source unit is incident, and a second fly-eye lens into which light from the first fly-eye lens is incident.
  • the light shielding plate may be disposed in the vicinity of the second fly-eye lens.
  • the optical system includes a first optical system from the light source unit to the second fly's eye lens, and a second optical system to the reflective modulation element after the second fly's eye lens. May be.
  • the optical axis of the first optical system and the optical axis of the second optical system may be relatively shifted. Thereby, the reflected light from the reflection type light modulation element to the light source unit can be sufficiently shielded.
  • the second fly-eye lens may include a plurality of lens cells arranged in the column direction and the row direction.
  • the first fly-eye lens may form an image of the light source unit on each of the plurality of lens cells of the second fly-eye lens.
  • the opening may have a size corresponding to a size of the image of the imaged light source. This makes it possible to display an image with uniform illuminance.
  • the light shielding plate has a plurality of strip-shaped openings having a width of a predetermined size in the row direction and extending in the column direction, and the light shielding parts disposed between the plurality of openings.
  • the plurality of openings may be disposed so as to face central regions of the plurality of lens cells.
  • the light shielding plate can be formed with a simple structure.
  • the size of the width of each of the plurality of openings may be 50% to 80% of the size of the lens cell in the row direction. Thereby, the reflected light to the light source unit can be sufficiently shielded without reducing the light utilization efficiency.
  • the opening may be the same number of holes as the plurality of lens cells arranged so as to face the central region of the plurality of lens cells. Thereby, the reflected light to the light source part can be sufficiently shielded.
  • the light shielding plate may be disposed on the reflective light modulation element side of the second fly's eye lens.
  • the image display device may further include a polarization conversion element.
  • the polarization conversion element is disposed between the second fly's eye lens and the light shielding plate, separates each of the plurality of divided lights into two, converts the polarization direction of one of the separated lights, and Either the separated light whose polarization direction has been converted or the other separated light is shifted in the column direction and emitted.
  • the optical axis of the first optical system and the optical axis of the second optical system may be relatively shifted in the column direction and the row direction, respectively.
  • the image display device may further include a cooling unit that cools the light shielding plate. Thereby, the influence on the other components by the heat which generate
  • the light shielding plate may be made of a material having high thermal conductivity. Thereby, the influence on the other components by the heat which generate
  • the light shielding plate may be made of a black surface-treated material. Thereby, the influence on other components by the light shielded by the light shielding plate being reflected again can be suppressed.
  • the one or more reflection-type light modulation elements may include three reflection-type light modulation elements that respectively modulate red light, green light, and blue light.
  • the optical system and the light shielding plate may be provided for the three reflective modulation elements for light of each color.
  • An image display method includes emitting light by a light source unit including at least one laser light source.
  • the light from the light source unit is divided into a plurality of divided lights and superimposed on the reflective light modulation element.
  • the reflection-type light is transmitted while the plurality of divided light traveling to the reflection-type light modulation element is transmitted through the opening by the light-shielding plate having openings arranged on the respective paths of the plurality of divided light.
  • the reflected light from the modulation element to the light source unit is shielded.
  • the reflected light modulation element modulates and reflects the superposed divided light beams to display an image.
  • a high-performance image display device and an image display method can be provided.
  • FIG. 1 is a schematic diagram illustrating an overall configuration of an image display device according to a first embodiment. It is a figure which shows schematic structure of the illumination optical system which concerns on this embodiment. It is a figure which shows another example about the light source part of the illumination optical system shown in FIG. It is the typical figure which looked at the 2nd fly eye lens concerning this embodiment from the front. It is the typical figure which looked at the light-shielding plate concerning this embodiment from the front. It is a figure which shows typically the positional relationship of a 2nd fly eye lens and a light-shielding plate. It is a figure which shows the detailed structure of the illumination optical system which concerns on this embodiment. It is a figure for demonstrating the shift amount of the 1st and 2nd optical axis.
  • FIG. 1 is a schematic diagram illustrating an overall configuration of an image display apparatus according to the first embodiment of the present technology.
  • the image display device 100 modulates light for each of red light, green light, and blue light (RGB color lights), and displays a color image by synthesizing the modulated light (image) for each color.
  • RGB color lights red light, green light, and blue light
  • As the image display device 100 for example, a projector that projects an image on a screen or the like is used.
  • the image display apparatus 100 includes an illumination optical system 10, a reflective polarizing element 1 (hereinafter referred to as a polarizing element 1), a reflective light modulating element 2 (hereinafter referred to as a light modulating element 2), and a color combining prism 3 (combining optics). System) and a projection lens 4 (projection optical system).
  • the illumination optical system 10, the polarizing element 1, and the light modulation element 2 are provided in three each for light of each color of RGB.
  • the illumination optical system 10 is an illumination optical system having a light source unit 11 (see FIG. 2) that emits laser beams of RGB colors.
  • the illumination optical system 10R includes a light source unit 11R that emits red laser light R
  • the illumination optical system 10G includes a light source unit 11G that emits green laser light G.
  • the illumination optical system 10B includes a light source unit 11B that emits blue laser light B.
  • the illumination optical system 10 irradiates the light modulation elements 2 serving as irradiated surfaces with the laser beams R, G, and B of the respective colors from the light source unit 11 with uniform illuminance portions.
  • the illumination optical system 10 will be described in detail later.
  • the light modulation element 2 is a reflection type light modulation element, and reflects and modulates incident laser light based on an image signal corresponding to each color light supplied from the outside.
  • a reflective liquid crystal element is typically used, but is not limited thereto.
  • the polarizing element 1 reflects laser light having a predetermined polarization direction and transmits laser light having a polarization direction different from the predetermined polarization direction.
  • the polarization direction of the laser light from the light source unit 11 is set to the predetermined polarization direction described above. Therefore, the laser light from the light source unit 11 is reflected by the polarizing element 1 toward the light modulation element 2.
  • the modulated light that has been polarization-modulated and reflected by the light modulation element 2 is optically compensated (fine adjustment of the phase modulation amount) by an optical compensation element (not shown), and then enters the polarization element 1 again.
  • part of the laser light incident on the polarizing element 1 is transmitted and incident on the color synthesis prism 3, and part of the laser light is reflected and returned to the illumination optical system 10.
  • the RGB laser beams are reflected in an unmodulated state and reflected by the polarizing element 1 toward the illumination optical system 10.
  • most of the laser light emitted from the illumination optical system 10 is returned as it is to the illumination optical system 10 as it is.
  • the color synthesis prism 3 transmits incident light (laser light G) in the green wavelength band in the direction of the projection lens 4 and reflects incident light (laser lights R and B) in the red wavelength band and the blue wavelength band in the direction of the projection lens 4. To do.
  • the color synthesizing prism 3 is configured by, for example, joining a plurality of glass prisms (four substantially identical isometric prisms).
  • the first interference filter reflects the blue laser beam B and transmits the red laser beam R and the green laser beam G.
  • the second interference filter reflects the red laser light R and transmits the blue laser light B and the green laser light G.
  • the projection lens 4 enlarges the combined light combined by the color combining prism 3 to a predetermined magnification and projects an image (image) on a screen (not shown).
  • FIG. 2 is a diagram showing a schematic configuration of the illumination optical system 10 according to the present embodiment.
  • the illumination optical system 10 shown in FIG. 2 is used as each of the illumination optical systems 10R, 10G, and 10B for laser beams of RGB colors.
  • the polarization element 1 provided in front of the light modulation element 2 is not shown in FIG.
  • the illumination optical system 10 includes a light source unit 11, an integrator optical system 12 as an optical system according to the present embodiment, and a light shielding plate 13.
  • the light source unit 11 includes at least one laser light source 14.
  • the light source unit 11 of the present embodiment includes a single laser light source (single laser light source) 14, an unillustrated divergence angle (divergence angle) adjustment unit, and a collimator lens 15.
  • the configuration of the laser light source 14 is not limited, and an arbitrary one may be used.
  • the divergence angle adjustment unit can adjust the laser light L from the laser light source 14, and includes, for example, a lens disposed after the laser light source 14. For example, the divergence angle is adjusted by adjusting the distance between the laser light source 14 and the lens and performing defocusing. A divergence angle adjusting unit having an arbitrary configuration may be used.
  • the collimator lens 15 irradiates the spread laser beam L on the first fly eye lens 16 of the integrator optical system 12 substantially uniformly. The size and the like of the collimator lens 15 may be set as appropriate.
  • the divergence angle of the light emitted from the collimator lens 15 may be adjusted by the divergence angle adjustment unit.
  • the configuration of the light source unit 11 is not limited to the configuration shown in FIG.
  • a two-dimensional laser array light source (surface light source) 17 in which a plurality of laser light sources 14 are arranged two-dimensionally may be used.
  • the laser light L may be uniformly irradiated on the first fly-eye lens 16 using such a laser array light source 17.
  • the spread angle of the laser light from each laser light source may be adjusted as appropriate.
  • the laser array light source 17 typically, the positions of the plurality of laser light sources and the positions of the plurality of lens cells of the first fly-eye lens 16 are associated with each other.
  • the integrator optical system 12 divides the laser light L from the light source unit 11 into a plurality of divided light beams L1 and causes the light beams to overlap and enter the light modulation element 2.
  • the integrator optical system 12 includes a first fly eye lens 16, a second fly eye lens 18, a condenser lens 19, and a field lens 20.
  • the laser light L from the light source unit 11 is divided into a plurality of divided lights L1 by the first and second fly-eye lenses 16 and 18, and the illuminance is made uniform.
  • the plurality of split lights L1 are superimposed on the light modulation element 2 through the condenser lens 19 and the field lens 20.
  • FIG. 4 is a schematic view of the second fly's eye lens 18 according to the present embodiment as viewed from the front (as viewed in the z direction in FIG. 2).
  • the second fly-eye lens 18 has a plurality of lens cells 22 arranged in the column direction (y direction) and the row direction (x direction).
  • ten lens cells 22 are arranged in a matrix of 10 in the column direction and 8 in the row direction, that is, 10 rows and 8 columns.
  • the x direction is the major axis direction
  • the y direction is the minor axis direction.
  • each cell 22 The size in the major axis direction of each cell 22 is described as a major axis cell size t1, and the size in the minor axis direction is described as a minor axis cell size t2.
  • the number of the plurality of lens cells 22 is not limited and may be set as appropriate.
  • the lens cell 22 for example, a spherical lens is used, but other lenses may be used.
  • a plurality of lens cells are also formed in the first fly-eye lens 16 so as to correspond to the plurality of lens cells 22 shown in FIG.
  • the same number of lens cells as the plurality of lens cells 22 of the second fly-eye lens 18 are formed in the first fly-eye lens 16.
  • the first and second fly-eye lenses 16 and 18 are arranged to face each other so that the corresponding lens cells overlap each other when viewed in the optical axis direction (z direction) along which the laser light L from the light source unit 11 travels.
  • the Accordingly, the first and second fly-eye lenses 16 and 18 are arranged without shifting the corresponding lens cells.
  • the convex lens surfaces are arranged so as to face each other, but the direction of the lens surfaces is not limited.
  • the lens surfaces may be arranged so that both face inward and face each other.
  • the configuration of the lens group for superimposing the plurality of divided lights L1 divided by the first and second fly-eye lenses 16 and 18 on the light modulation element 2 is not limited and may be appropriately designed.
  • the laser light L emitted from the light source unit 11 is linearly polarized light.
  • the polarization direction is set to a predetermined polarization direction that can be reflected by the polarizing element 1 described above.
  • the polarization direction is set to coincide with the polarization direction of the light modulation element 2.
  • the illumination optical system 10 maintains the polarization direction of the laser light L from the light source unit 11 to keep the light utilization efficiency high without adding a P / S conversion element (PS converter) or the like. it can.
  • PS converter P / S conversion element
  • the polarization ratio of the laser light L emitted from the light source unit 11 is 10 or more. That is, of the P component and the S component, when the subordinate polarization component is 1, the main polarization component is 10 or more. Laser light L having a higher polarization ratio may be emitted. If the desired polarization ratio cannot be obtained, the optical efficiency may be improved by using a P / S converter or the like as appropriate.
  • FIG. 5 is a schematic view of the light shielding plate 13 according to the present embodiment as viewed from the front.
  • the light shielding plate 13 is disposed in the integrator optical system 12.
  • the light shielding plate 13 includes an opening 23 disposed on each path of the plurality of divided lights L1 and a light shielding unit 24 that shields reflected light returning from the light modulation element 2 to the light source unit 11.
  • the opening 23 extending in the y direction is visible so that the orientation of the light shielding plate 13 can be easily grasped.
  • the light shielding plate 13 is disposed in the vicinity of the second fly-eye lens 18 in the optical axis direction (z direction) along which the laser light L travels.
  • the light shielding plate 13 is disposed between the second fly-eye lens 18 and the condenser lens 19 immediately after the second fly-eye lens 18 (on the light modulation element 2 side).
  • the light shielding plate 13 may be disposed immediately before the second fly-eye lens 18 (on the light source unit 11 side).
  • the vicinity of the second fly-eye lens 18 typically means a range within several millimeters before and after the second fly-eye lens 18 in the z direction. However, it is not limited to this range.
  • the position where the light shielding plate 13 can be arranged is determined by the relationship between the size of the opening 23 and the size of the light beams of the divided lights L1 before and after the second fly-eye lens 18.
  • an image of the laser light source L is formed on each lens cell 22 of the second fly-eye lens 18 by the first fly-eye lens 16. Then, the second fly-eye lens 18 forms an image of the first fly-eye lens 16 on the light modulation element 2 via the condenser lens 19 and the like. Therefore, if the light shielding plate 13 is arranged at a distance in front of the second fly-eye lens 18, the image is large on the second fly-eye lens 18, and the first fly-eye lens is large. Each divided light L1 from 16 hits the light shielding part 24, and the amount of light is lost.
  • the light shielding plate 13 when the light shielding plate 13 is arranged at a distance from the second fly-eye lens 18 to the condenser lens 19 side, an image is formed to form an image of the first fly-eye lens 16 on the light modulation element 2. Therefore, there is a high possibility that the light will be shielded by the light shielding unit 24.
  • a range in which the light shielding plate 13 can be disposed may be set as appropriate as long as such a problem does not occur.
  • the light shielding plate 13 may be disposed in contact with the second fly-eye lens 18.
  • the light shielding plate 13 may be arranged at a predetermined interval from the second fly eye lens 18. In this case, it is possible to prevent the heat generated in the light shielding plate 13 from being directly conducted to the second fly-eye lens 18, other optical components, mechanical components, and the like. Further, the gap with the second fly-eye lens 18 can be used as a wind passage for cooling the light shielding plate 13.
  • the light shielding plate 13 has a width of a predetermined size in the row direction (x direction) of the second fly's eye lens 18 and extends in the column direction (y direction).
  • a plurality of strip-shaped openings 23 are formed.
  • a light shielding portion 24 is disposed between the plurality of openings 23.
  • the plurality of openings 23 are formed in the same number as the number of rows of the plurality of lens arrays 22 shown in FIG.
  • the major axis size t3 of the opening 24 has at least the size of ten short axis cell sizes t2 of the plurality of lens arrays 22.
  • FIG. 6 is a diagram schematically showing the positional relationship between the second fly-eye lens 18 and the light shielding plate 13.
  • the light shielding plate 13 is arranged so that the plurality of openings 23 face the central regions 25 of the plurality of lens cells 22.
  • the central region 25 of the lens cell 22 is a region in a predetermined range including the center of the lens cell 22, and is a region according to the size of the light beam of the divided light L ⁇ b> 1 traveling from the first fly-eye lens 16. In other words, it is an area corresponding to the size of the image formed on each lens cell 22 of the second fly-eye lens 18.
  • the width t4 (opening width) of each of the plurality of openings 23 is not less than 50% and not more than 80% of the long axis cell size t1 of the plurality of lens cells 22 of the second fly-eye lens 18.
  • the size of the light shielding part 24 is set so that the light shielding part 24 is arranged in the range of 20% to 50% of the long axis cell size t1.
  • the size of the opening 23 relative to the long axis cell size t1 is not limited and may be set as appropriate. If the size of the opening 23 is too large, the light blocking rate of the return light from the light modulation element 2 is lowered.
  • the size of the opening 23 is too small, the light traveling from the light source unit 11 to the light modulation element 2 is blocked, and the light use efficiency is lowered. What is necessary is just to adjust suitably considering such a point.
  • the size t4 of the width of the opening 23 is set to 65% of the long axis cell size t1 and the light shielding portion 24 is set to 35%, nearly 100% of the light passes through the opening and about 80% of the return light is about 80%. It could be shielded by the light shielding plate 13.
  • the size of the opening 23 is set with respect to the long axis cell size t1 of the lens cell 22.
  • the size of the opening 23 may be set as appropriate based on other conditions.
  • the size of the opening 23 may be appropriately set according to the size of the image formed on each lens cell 22 of the second fly-eye lens 18 described above.
  • the size of the opening 23 is set so as to include at least the size of the image.
  • the material of the light shielding plate 13 As the material of the light shielding plate 13, a metal such as stainless steel is used.
  • the light shielding plate 13 often has high heat due to reflected light returning from the light modulation element 2. Accordingly, a material having high thermal conductivity such as aluminum or copper may be used. As a result, the influence of heat on other optical components and mechanical components can be reduced.
  • a material whose surface is treated in black may be used.
  • the surface treatment method is not limited, and coating, plating, anodizing, chemical conversion treatment, or the like may be used as appropriate.
  • FIG. 7 is a diagram showing a detailed configuration of the illumination optical system 10 according to the present embodiment.
  • an optical system from the light source unit 11 to the second fly's eye lens 18 is referred to as a first optical system 27.
  • the optical system up to the light modulation element 2 after the second fly lens 18 is a second optical system 28. Accordingly, the first fly-eye lens 16 shown in FIG. 7 is included in the first optical system 27, and the condenser lens 19 and the field lens 20 are included in the second optical system 28.
  • the paths passing through the centers of the first and second fly-eye lenses 16 and 18 and the light shielding plate 13 are set as the optical axis of the first optical system 27 (referred to as the first optical axis O1).
  • the first optical axis O1 is set at the approximate center of the laser light emitted from the collimator lens 15 (or the two-dimensional laser array light source 17). That is, the position of the single laser light source 14 (or the center position of the two-dimensional laser array light source 17) is aligned with the first optical axis O1.
  • the laser light L from the light source unit 11 travels with the first optical axis O1 as a reference.
  • the optical axis of the second optical system 28 (described as the second optical axis O2).
  • the second optical axis O2 is aligned with the incident position of the subsequent polarizing element 1 (light modulation element 2). Accordingly, the laser light L incident on the second optical system 28 is incident on the polarizing element 2 (light modulation element 1) with the second optical axis O2 as a reference.
  • the optical axis O1 of the first optical system 27 and the second optical axis O2 of the second optical system 28 are set to be relatively shifted in the row direction (x direction). Accordingly, the laser light L emitted from the second fly-eye lens 18 through the opening 23 of the light shielding plate 13 with the first optical axis O1 as a reference travels to the light modulation element 2 with the second optical axis O2 as a reference. Will do.
  • the laser light L2 (divided light) shown in FIG. 7 passes through the approximate center of the lens cell 22 of the second fly-eye lens 18 and enters the second optical system 28 through the opening 23.
  • the laser beam L2 incident on the condenser lens 19 of the second optical system 28 is incident on the light modulation element 2 through the field lens 20 and the polarization element 1 (not shown) with the second optical axis O2 as a reference.
  • the polarization is not modulated by the light modulation element 2
  • the reflected light L ⁇ b> 3 reflected by the light knitting modulation element 2 is reflected by the polarization element 1 toward the light source unit 11.
  • the reflected light L3 passes through the field lens 20 and the condenser lens 19 through a position symmetrical to the outgoing laser light L2 with respect to the second optical axis O2.
  • the reflected light L3 emitted from the condenser lens 19 toward the light source unit 11 is shielded by the light shielding unit 24 of the light shielding plate 13. Thereby, the influence to the light source part 11 by the said reflected light L3 can be prevented.
  • FIG. 8 is a diagram for explaining the shift amounts of the first and second optical axes O1 and O2.
  • the position of the second optical axis O2 is aligned with the end portion 29 of the light shielding portion 24 that is disposed at the position of the first optical axis O1 and is the center of the light shielding plate 13.
  • the shift amount t5 of the first and second optical axes O1 and O2 is substantially half of the width size (the size in the row direction) of the light shielding portion 24.
  • the shift amount t5 is not limited, and may be set as appropriate so that the reflected light L3 that is returned is shielded by the light shielding portion 24 while the opening 23 is positioned on the path of the laser light L2.
  • the configuration of the light shielding plate 13 and the like may be set so that the shift amount t5 is 1 ⁇ 4 of the long-axis lens size t1 of each lens array 22 of the second fly-eye lens 18.
  • a polarization conversion element PS converter
  • the above-described polarization conversion element is required.
  • the optical axis of the light after the polarization conversion element is inevitably shifted by 1 ⁇ 4 of the long axis cell size t1 of the second fly's eye lens 18. Accordingly, by setting the shift amounts of the first and second optical axes O1 and O2 to the above-described shift amounts, even if a non-polarized light source is used instead of the laser light source 14, the same mechanical structure can be used. Is possible.
  • FIG. 9 is a diagram schematically illustrating an optical principle (image transition) of image display in the image display apparatus 100 according to the present embodiment.
  • FIG. 10 is a diagram schematically showing an image formed on each optical member.
  • the reflection type polarization element 1 is not shown, and accordingly, the light that is polarization-modulated by the reflection type light modulation element 2 is shown to pass through the light modulation element 2 for convenience.
  • FIG. 10 is a schematic diagram for explaining the transition of the image from the laser light source 14 with emphasis on the relative size of each image, the number of images of the plurality of divided lights L1, and the like. Are illustrated differently.
  • an image of the light source unit 11 is formed on the second fly-eye lens 18 via the first fly-eye lens 16.
  • a substantially equal circular image I1 is formed on each lens cell 22 of the second fly-eye lens 18 (FIG. 10B).
  • an image I2 of each lens cell (rectangular shape) of the first fly-eye lens 16 irradiated uniformly with the light from the light source unit 11 is formed on the light modulation element 2 via the second fly-eye lens 18.
  • An image is formed (FIG. 10C).
  • FIG. 11 is a diagram showing the image formation in detail.
  • Each lens cell 22 of the second fly-eye lens 18 causes an image I2 of each lens cell of the first fly-eye lens 16 to pass through the opening 23 of the light shielding plate 13, the condenser lens 19, and the field lens 20.
  • An image is formed on the light modulation element 2.
  • each of the plurality of divided lights L1 is irradiated and superimposed on the entire light modulation element 2.
  • the opening 23 of the light shielding plate 13 is formed in a size that allows at least the light of the image I1 to pass therethrough according to the size of the image I1 shown in FIG. 10B.
  • the image I3 of the second fly-eye lens 18 is formed at the position of the diaphragm 30 in the projection lens 4 via the light modulation element 2.
  • the aperture 30 of the projection lens 4 has a circular shape substantially equal to the shape of the laser light source 13 as an image I3 of the second fly lens, and an image in which it is arranged in a matrix is formed ( FIG. 10D).
  • a rectangular image I4 of the light modulation element 2 is formed on the screen 31 through the diaphragm 30 of the projection lens 4 (FIG. 10E).
  • the laser light L from the light source unit 11 is modulated by the light modulation element and projected onto the screen 31 as an image.
  • this principle is applied to the image display apparatus 1 shown in FIG. 1, the laser beams R, G, and B of RGB colors are modulated by the light modulation elements 2R, 2G, and 2B, respectively.
  • the modulated light of each color is synthesized by the color synthesis prism 3 and projected onto the screen 31 via the projection lens 4. As a result, a color image is displayed.
  • the light from the laser light source 14 is divided into the plurality of divided lights L1 by the first and second fly-eye lenses 16 and 18, and is superimposed on the light modulation element 2 by the second optical system 28. .
  • a light shielding plate 13 is disposed in the vicinity of the second fly's eye lens 18, and this light shielding plate 13 modulates the light without blocking a plurality of divided lights L2 traveling to the light modulation element 2, as shown in FIG.
  • the reflected light L3 from the element 2 to the light source unit 11 is shielded. Thereby, the influence to the light source part 11 by the said reflected light L3 can be prevented. As a result, a high-performance image display device 100 using the laser light source 14 can be realized.
  • the divergence angle from the laser light source 14 (including the divergence angle from the collimator lens 15) is controlled, and the first fly-eye lens 16 is irradiated with the laser light L with the divergence angle widened.
  • the image I1 formed on the second fly-eye lens 18 has a predetermined size. This is based on the optical principle of “Lagrange invariant”. Briefly, the product of the size of an object serving as a light emitting point and the angle of light emitted from the object is preserved through any optical system. If the light from the light source unit 11 is parallel light, the image I1 formed by each lens cell of the first fly-eye lens 16 theoretically becomes a point.
  • the opening 23 of the light shielding plate 13 is formed in a size that allows at least the light of the image I1 to pass through according to the size of the image I1 shown in FIG. 10B. If this point is described in more detail, in order to uniformly irradiate the light from the light source unit 11 to the first fly-eye lens 16, the light from the light source unit 11 is not parallel light but emitted at a certain divergence angle. The As a result, the image I1 on the second fly-eye lens 18 has a predetermined size, and the opening 23 of the light shielding plate 13 is formed with a size corresponding to the size of the image I1. In other words, by forming the opening 23 with such a size, an image with uniform illuminance can be displayed on the screen 31.
  • the size of the image I1 formed on the second fly-eye lens 18 is also possible to intentionally adjust the size of the image I1 formed on the second fly-eye lens 18 by appropriately adjusting the divergence angle of light from the light source unit 11. That is, the angle of divergence from the light source unit 11 (including the lens) is adjusted, and the image of the light source unit 11 is designed to have a predetermined size on the second fly-eye lens 18, and the opening of the light shielding plate 13 is adjusted to match the image. It is also possible to design the width size t4 of the portion 23 as appropriate. For example, by adjusting the divergence angle, the size of the image I1 is adjusted to be 50% or more and 80% or less of the long axis cell size t1 of the second fly's eye lens 18, and the width size of the opening 23 is adjusted accordingly. A design in which t4 is 50% or more and 80% or less of the long axis cell size t1 and the rest is a light shielding region is also conceivable.
  • the technology related to lasers has greatly advanced, and it has become possible to produce high light output with a small size and high efficiency.
  • the laser light source can realize high brightness, high color gamut, and has a long life. Therefore, it has many merits such that the maintenance cost of the light source can be reduced.
  • the market with the spread of 3D and the like, products with higher brightness are demanded, and the development of projectors that employ lasers as light sources is in progress.
  • the illumination optical system 10 and the image display apparatus 100 it is possible to shield the return light to the light source 11 side by disposing the light shielding plate 13 in the integrator optical system 12. It is. As a result, it is possible to prevent a change in optical characteristics and a decrease in life due to a temperature rise of the laser light emitting element. As a result, stable performance as a product can be exhibited, and the merit of the long life inherent in lasers can be utilized, so that maintenance costs can be significantly reduced compared to lamps used in conventional projectors.
  • FIG. 12 and 13 are diagrams showing a schematic configuration of the illumination optical system 210 according to the present embodiment.
  • FIG. 12 is a view of the illumination optical system 210 as viewed from above (y direction), and corresponds to FIG. 4 of the first embodiment.
  • FIG. 13 is a view of the illumination optical system 210 as viewed from the side (x direction).
  • the column direction and the row direction are set to the y direction and the x direction, respectively. Therefore, the major axis direction of the lens cell 222 is the x direction, and the minor axis direction is the y direction.
  • the light shielding plate 213 has a plurality of openings 223 extending in the column direction, and is disposed on the light modulation element 202 side of the second fly-eye lens 218. In FIG. 12, the opening 223 extending in the y direction is visible so that the orientation of the light shielding plate 213 can be easily grasped. In FIG. 13, a light shielding part 224 between the openings 223 is illustrated.
  • a PS converter 250 is disposed as a polarization conversion element between the second fly-eye lens 218 and the light shielding plate 213.
  • the PS converter 250 separates each of the plurality of split lights L1 emitted from the second fly-eye lens 218 into two based on the polarization direction, and converts the polarization direction of one of the separated lights. Then, either the separated light whose polarization direction is converted or the other separated light is shifted in the column direction and emitted.
  • the PS converter 250 is used to align the polarization of light incident on the light modulation element in one direction when a non-polarized light source is used.
  • laser light whose polarization is aligned is emitted by the laser light source 211.
  • the light (each divided light L1) emitted from the second fly-eye lens 218 often becomes light including P-polarized light and S-polarized light. Therefore, by aligning the polarization direction again in one direction by the PS converter 250, it becomes possible to make the light with the polarization direction aligned with high accuracy incident on the light modulation element 202.
  • the split light L1 (P + S polarized light) that has passed through the second fly-eye lens 218 is converted into P polarized light (one separated light) and S polarized light (the other separated light) by the PS separation film 251 in the PS converter 250. Separated).
  • the P-polarized light is transmitted as it is, and the S-polarized light is reflected in the column direction (y direction).
  • the transmitted P-polarized light is rotated by the half-wave plate 252 and emitted as S-polarized light.
  • the S-polarized light reflected by the PS separation film 251 is further reflected by the S reflection film 253 and emitted.
  • the S-polarized light is emitted after being shifted in the column direction. In this way, all the light emitted from the PS converter 250 becomes S-polarized light.
  • FIG. 15A is a schematic diagram of an image I5 of light emitted from the second fly-eye lens 18.
  • FIG. FIG. 15B is a schematic diagram of an image I6 of light emitted from the PS converter 250. Since the S-polarized light separated by the PS separation film 251 is shifted in the column direction and emitted, the light image I6 extends in the column direction and forms an image. Depending on the position of the image I6 and the size in the row direction, a strip-shaped opening 223 is formed. As a result, it is possible to make light having the polarization direction aligned with high accuracy incident on the light modulation element 202 while exhibiting high light utilization efficiency.
  • the position of the half-wave plate 252 of the PS converter 250 may be changed on the path of the light that is shifted in the column direction and emitted.
  • the polarization direction of the light emitted from the PS converter 250 can be changed.
  • a half-wave plate 252 is attached to the side reflected by the S reflection film 253 and shifted in the column direction.
  • all the light emitted from the PS converter 250 becomes P-polarized light.
  • the polarization direction may be set as appropriate so that the direction of polarization is in the long side direction of the liquid crystal element.
  • the shift amount between the first optical axis O1 of the first optical system and the second optical axis O2 of the second optical system will be described.
  • the first optical axis O1 and the second optical axis O2 are shifted from each other in the row direction (x direction). This is for shielding the reflected light L3 to the light source unit 211 by the light shielding unit 224 as described in the first embodiment.
  • the shift amount may be set as appropriate.
  • the first optical axis O1 and the second optical axis O2 are shifted from each other also in the column direction (y direction). This is done by shifting the optical axis of the emitted light by the PS converter 250. That is, the optical axis is an intermediate position between the lowermost light beam B1 and the uppermost light beam B2 of the light emitted from the PS converter 250 shown in FIG. The position becomes a shift position in the y direction by 1/4 of the short axis cell size of each lens cell 222 of the second fly-eye lens 218.
  • the second optical axis O2 of the second optical system is also shifted in the y direction by 1 ⁇ 4 of the short axis cell size.
  • the first optical axis O1 and the second optical axis O2 are relatively shifted in the column direction and the row direction, respectively.
  • the return light is cut by separating the light in the y direction and shifting the optical axis in the x direction.
  • the light may be separated in the x direction and the optical axis may be shifted in the y direction.
  • a plurality of strip-shaped openings extending in the x direction may be formed. A similar effect can be obtained with such a configuration.
  • FIG. 16 and 17 are schematic diagrams showing examples of other embodiments.
  • a part of the light shielding plate 313 is extended to form an extension 360.
  • the extension 360 is provided with a cooling unit 370 that cools the light shielding plate 313.
  • an extension 360 is formed on one of two sides 361 facing each other in the row direction (x direction) of the light shielding plate 313 so as to be bent in the optical axis direction (z direction). And the Peltier element 371 and the heat sink 372 are contact
  • an extension 360 is formed on both sides 361, and a Peltier element 371 and a heat sink 372 are provided on both extensions 360.
  • the shape and formation position of the extension 360 are not limited, and any configuration may be employed. As shown in FIG. 16, it may be provided so as to be bent in an L shape or the like, or an extension 360 may be provided along the planar direction of the light shielding plate 313. Any configuration may be used as long as the light shielding plate 313 and the cooling unit 370 can be thermally connected. In order to prevent a decrease in luminance due to dust adhering to the optical component, when the entire illumination optical system has a sealed structure, it is conceivable that the light shielding plate 313 is fixed at a predetermined position by insertion. In this case, the configuration as shown in FIG. 16 is effective.
  • the configuration of the cooling unit is also arbitrary. Any device may be used as the Peltier element 371 and the heat sink 372, and a member other than these members may also be used as the cooling unit 370.
  • a cooling fan 373 or the like may be included in the cooling unit by blowing air to the Peltier element 371, the heat sink 372, or the like. Thereby, a cooling function can be improved.
  • a liquid cooling type using a tube or the like may be used as the cooling unit 370.
  • FIG. 18 is a schematic diagram showing an example of another embodiment of the light shielding plate.
  • the light shielding plate 413 is formed with a plurality of holes 480 corresponding to the plurality of lens cells of the second fly-eye lens, corresponding to the plurality of lens cells, as openings 423.
  • the light shielding plate 413 is disposed so that these holes 480 are opposed to the central region of each lens cell. By forming such an opening 423, the light blocking rate of reflected light can be improved, and the reflected light to the light source can be sufficiently blocked.
  • three light source sections are provided for each color of RGB laser light.
  • one light source unit that emits white laser light may be used.
  • the white laser light may be divided into RGB laser light, and the laser light of each color may be incident on three light modulation elements that respectively modulate red light, green light, and blue light.
  • the first optical axis of the first optical system and the second optical axis of the second optical system are shifted from each other.
  • the optical axis may not be shifted.
  • this technique can also take the following structures.
  • a light source unit including at least one laser light source; One or more reflective light modulators that modulate and reflect incident light;
  • An optical system that divides the light from the light source unit into a plurality of divided light beams and makes them overlap each other and enter the one or more reflective light modulation elements;
  • a light-shielding plate that is disposed in the optical system and has an opening disposed on each path of the plurality of divided lights, and a light-shielding unit that shields reflected light from the reflective light modulation element to the light source unit
  • An image display device comprising: (2) The image display device according to (1), The optical system has a first fly-eye lens into which light from the light source unit is incident, and a second fly-eye lens into which light from the first fly-eye lens is incident, The image display device, wherein the light shielding plate is disposed in the vicinity of the second fly-eye lens.
  • the image display device includes a first optical system from the light source unit to the second fly's eye lens, and a second optical system to the reflective modulation element after the second fly's eye lens. , An image display apparatus in which an optical axis of the first optical system and an optical axis of the second optical system are relatively shifted.
  • the image display device has a plurality of lens cells arranged in a column direction and a row direction, The first fly-eye lens forms an image of the light source unit on each of the plurality of lens cells of the second fly-eye lens,
  • the image display apparatus according to claim 1, wherein the opening has a size corresponding to a size of the image of the imaged light source unit.
  • the image display device has a plurality of strip-shaped openings having a width of a predetermined size in the row direction and extending in the column direction, and the light shielding parts disposed between the plurality of openings. And an image display device in which the plurality of openings are arranged so as to face central regions of the plurality of lens cells.
  • the width of each of the plurality of openings is 50% or more and 80% or less of the size of the lens cell in the row direction.
  • the image display device (4), The image display apparatus according to claim 1, wherein the opening is a plurality of holes equal in number to the plurality of lens cells arranged to face a central region of the plurality of lens cells.
  • the image display device (5), The light shielding plate is disposed on the reflective light modulation element side of the second fly-eye lens, The image display device is disposed between the second fly-eye lens and the light shielding plate, separates each of the plurality of divided lights into two, converts the polarization direction of one of the separated lights, and Further comprising a polarization conversion element that outputs the separated light whose polarization direction has been converted, or the other separated light that is shifted in the column direction, and then exits.
  • An image display device in which an optical axis of the first optical system and an optical axis of the second optical system are relatively shifted in the column direction and the row direction, respectively.
  • the light shielding plate is an image display device made of a material having high thermal conductivity.
  • the light shielding plate is an image display device made of a black surface-treated material.
  • the image display device according to any one of (1) to (11),
  • the one or more reflective light modulation elements include three reflective light modulation elements that respectively modulate red light, green light, and blue light,

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
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Abstract

La présente invention se rapporte, selon un mode de réalisation, à un dispositif d'affichage d'image qui comprend : une unité de source de lumière; un ou plusieurs éléments de modulation de lumière de type réfléchissant; un système optique; et une plaque de protection contre la lumière. L'unité de source de lumière comprend au moins une ou plusieurs sources de lumière laser. Le ou les éléments de modulation de lumière de type réfléchissant modulent et réfléchissent la lumière incidente à ce dernier ou à ces derniers. Le système optique divise la lumière provenant de l'unité de source de lumière en une pluralité de divisions de lumière, et ces divisions sont chacune superposées et rendues incidentes à un ou plusieurs éléments de modulation de lumière de type réfléchissant. La plaque de protection contre la lumière est disposée dans le système optique, et comprend des unités d'ouverture disposées sur chaque trajet de la pluralité de divisions de lumière ainsi que des unités de protection qui protègent contre la lumière réfléchie vers l'unité de source de lumière et provenant des éléments de modulation de lumière de type réfléchissant.
PCT/JP2013/007626 2013-03-22 2013-12-26 Dispositif d'affichage d'image et procédé d'affichage d'image WO2014147688A1 (fr)

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